解调器

例句：

1. 1. The modem is a device that converts digital signals into analog signals for transmission over telephone lines.
   调制解调器是一种设备，将数字信号转换为模拟信号以通过电话线传输。
2. 2. The modem is used to connect computers to the internet.
   调制解调器用于将计算机连接到互联网。
3. 3. The modem was upgraded to support higher data rates.
   调制解调器已被升级以支持更高的数据速率。